Product and application brief
A split spring washer is a single-turn helical ring with a gap and ends at different axial levels in its free state. It is commonly sold as a spring lock washer. End shape and cross-section distinguish the product; the trade name alone does not establish locking performance or make it interchangeable with a toothed, curved or flat washer.
Product forms and reference names
| Product form / field | Reference and distinguishing details |
|---|---|
| Flat-end form — DIN 127 B reference | Commercial catalogues associate the B designation with flat-ended split spring washers. Identify the end form and selected specification rather than ordering by diameter alone. |
| Bent-end form — DIN 127 A reference | Commercial catalogues associate the A designation with bent-ended split spring washers. The end detail differs from the flat-end form; confirm it on a drawing or product specification. |
| DIN 127:1987-10 — withdrawn reference | DIN Media lists this edition as withdrawn. It remains a recognizable commercial reference, not a statement that DIN 127 is a current standard or that a supplied part is compliant. |
| Other spring and locking washer forms | Curved spring washers, toothed washers and flat washers are different constructions. A shared nominal fastener size does not establish an approved substitution. |
End form before material or finish
Select flat or bent ends explicitly. Bossard identifies DIN 127 B on its flat-end catalogue entry and DIN 127 A on its bent-end entry, both with a withdrawn-standard note. Those catalogue identities are examples for recognizing a form, not FastenerBridge brand affiliation or supply evidence.
Nominal size, hole and free height
Record the nominal mating fastener size separately from the required inside diameter, outside diameter and material thickness. For a helical ring, free height is a separate geometric field from section thickness. Use the selected specification or drawing for actual values and tolerances; this illustration is not a measuring reference.
Legacy references and assembly requirements
Confirm the requested edition and end type when a bill of materials uses DIN 127. Do not silently convert a withdrawn reference to a current ISO designation or substitute another washer form. Joint suitability, vibration resistance and installation requirements need assembly-specific evidence; no load, tightening torque or reuse guarantee is stated here.
Specification fields
| Product form / field | Reference and distinguishing details |
|---|---|
| Product identity | Split helical form; flat or bent end; exact reference and edition or controlled drawing/revision. |
| Size and clearance | Nominal fastener size, inside and outside diameter, required tolerances and mating surface constraints. |
| Section and free shape | Material thickness/cross-section, free height and end detail as defined by the selected specification. |
| Material | Material designation and any specified hardness or inspection requirements; do not infer them from silver appearance. |
| Finish | Required coating or surface condition and its specification; confirm compatibility with the assembly. |
| Quantity and documents | Quantity with units, size-by-size list and drawings/specifications; keep unresolved requirements visible. |
Common product questions
What is the difference between DIN 127 A and B references?
Supplier catalogues identify A as the bent-end form and B as the flat-end form. Confirm the actual end geometry and requested specification instead of substituting on nominal size alone.
Is DIN 127 a current standard?
DIN Media lists DIN 127:1987-10 as withdrawn. Commercial references can still help identify a part, but they do not prove current-standard status or conformity of a supplied washer.
Does the spring lock washer name guarantee resistance to loosening?
No. A product name or illustration does not establish joint performance. The selected part, mating surfaces and application requirements need appropriate verification; this page gives no vibration, load or torque guarantee.
Related washer types
Product references
References checked 6 October 2026 explain product identity. Third-party model names and approvals are not FastenerBridge brand affiliation, stock or certification claims. Final geometry and requirements follow the selected specification.
Related specification guides
- Read standard numbers, editions and proposed alternatives
- Identify assembly inputs and product-specific installation instructions
- Explore related connection arrangements
These guides explain specification choices; they are not an approval, substitution rule or installation value for this product.